Which geologic principle is the reason the top stratum in a section of rock is the youngest?

Law of superposition

Law of superimposition is a principle of geology, which suggests that when the rocks gets weathered, the newly formed sediments acquire the top layers of the soil strata whereas, the old layers seeps inside the deeper or bottom layers. As, the bottom layers are covered with new layers of sediments. Hence, new layers are considered as young and bottom layers as old.

Therefore, according to the law or principle of superposition the top stratum in the section of rock is the youngest.

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chromosomes carry the genetic information for organisms. also, chromatin is the thread like dna which is located in the nucleus of an organism.